I am a little suspicious of the article, as the tests were rather artificial.
I had a lot of problems with dust in my D200 early on. When I found the first signs of dust, I gave it a thorough cleaning, including the mirror chamber. I am now more careful about changing lenses and always turn the camera off, do the change quickly, and above all avoid changing lenses in high pollen areas. I don't seem to have too many problems these days though bluebell woods are hell!
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